CN115249558B - A rare earth permanent magnet containing cerium - Google Patents
A rare earth permanent magnet containing cerium Download PDFInfo
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- CN115249558B CN115249558B CN202210856487.8A CN202210856487A CN115249558B CN 115249558 B CN115249558 B CN 115249558B CN 202210856487 A CN202210856487 A CN 202210856487A CN 115249558 B CN115249558 B CN 115249558B
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 60
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 57
- 229910052684 Cerium Inorganic materials 0.000 title claims abstract description 23
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000005245 sintering Methods 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 229910052777 Praseodymium Inorganic materials 0.000 claims abstract description 8
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052771 Terbium Inorganic materials 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 229910052692 Dysprosium Inorganic materials 0.000 claims abstract 3
- 229910052689 Holmium Inorganic materials 0.000 claims abstract 3
- 229910052758 niobium Inorganic materials 0.000 claims abstract 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 24
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005324 grain boundary diffusion Methods 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 150000000703 Cerium Chemical class 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000001652 electrophoretic deposition Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Abstract
本发明属于稀土永磁材料技术领域，涉及一种含铈稀土永磁体，该永磁体的化学通式按质量百分比为：(CexRE1‑x)30Fe69.1‑yB0.9TMy，其中：0.018≤x≤0.18,0.5≤y≤2.5；RE为Pr、Nd、Dy、Tb、Ho中的一种或者几种；TM为Ga、Co、Al、Cu、Nb、Zr、Ti中的一种或者几种；所述永磁体中，替换RE的稀土Ce元素以CeFe2相形式存在于晶界，所述永磁体的主相具有RE2Fe14B相结构；所述永磁体通过制备速凝片、破碎制粉、磁场取向成型、烧结和热处理获得。本发明为含铈的高性能低成本稀土永磁体，该稀土永磁体在钕铁硼磁体中掺杂了一定量的高丰度稀土Ce，与市场现有的钕铁硼磁体相比，原材料成本大幅下降，但是仍然能够保持永磁体的磁性能不降低，具有显著的成本和价格优势。
The invention belongs to the technical field of rare earth permanent magnet materials and relates to a cerium-containing rare earth permanent magnet. The chemical general formula of the permanent magnet is as follows by mass percentage: (Ce x RE 1‑x ) 30 Fe 69.1‑y B 0.9 TM y , wherein: 0.018≤x≤0.18, 0.5≤y≤2.5; RE is one or more of Pr, Nd, Dy, Tb and Ho; TM is one or more of Ga, Co, Al, Cu, Nb, Zr and Ti; in the permanent magnet, a rare earth Ce element replacing RE exists in a grain boundary in the form of a CeFe 2 phase, and a main phase of the permanent magnet has a RE 2 Fe 14 B phase structure; the permanent magnet is obtained by preparing a quick-setting sheet, crushing and powdering, magnetic field orientation molding, sintering and heat treatment. The present invention is a high-performance and low-cost rare earth permanent magnet containing cerium. The rare earth permanent magnet is prepared by doping a certain amount of high-abundance rare earth Ce into a neodymium iron boron magnet. Compared with the existing neodymium iron boron magnets on the market, the cost of raw materials is greatly reduced, but the magnetic properties of the permanent magnet can still be maintained without reduction, thus having significant cost and price advantages.
Description
Technical Field
The invention belongs to the technical field of rare earth permanent magnet materials, and particularly relates to a high-performance low-cost cerium-containing rare earth permanent magnet.
Background
In recent years, with the rapid development of fields such as new energy automobiles, wind power generation, high-efficiency energy-saving household appliances and the like, the demand for rare earth permanent magnet materials is increasing. The price of the high-abundance rare earth Ce is only 2.6% of PrNd, and the rare earth Ce with abundant reserves and low price is used for preparing the permanent magnet material, so that the cost can be greatly reduced, and the rare earth raw material which can be used for manufacturing the neodymium iron boron can be doubled. However, the internal natural disposition of the Ce 2Fe14 B compound can be obviously lower than Nd 2Fe14 B, and the addition of Ce in the NdFeB magnet can lead to obvious reduction of the magnetic performance of the magnet (see the document IEEE.Trans.Magn.2014, 50:2102605). chinese patent CN104575920B proposes a rare earth permanent magnet and a preparation method thereof, wherein the magnet has higher coercive force when the Ce substitution amount is 24% -32%, and the residual magnetism Br, coercive force Hcj and magnetic energy product (BH) max of the magnet gradually decrease along with the increase of the Ce content when the Ce substitution amount is less than 24%. The application discloses a grain boundary diffusion cerium magnet containing REFe 2 phases and a preparation method thereof, which are proposed by Chinese patent CN 110148507B filed by the applicant in advance, wherein the Ce substitution amount is 20% -85%, and the original cerium magnet contains 2-14-1 main phases, REFe 2 phase and rare earth-rich phase, wherein the original magnet contains REFe 2 phase and rare earth-rich phase in the grain boundary, the rare earth-rich phase is generally Nd-rich phase, a part of Nd enters the grain boundary to form rare earth-rich phase and can not completely enter Nd 2Fe14 B main phase, the advantage of high natural disposition energy in Nd 2Fe14 B phase can not be fully exerted, the magnetic performance of the magnet is overall low, and when the Ce substitution amount is 20%, the residual magnetism Br of the magnet is only 12.59kGs, the magnetic energy product (BH) max is only 38.25MGOe. In the preparation process of the technical scheme, grain boundary diffusion treatment is carried out at 850-1000 ℃ by adopting methods such as coating, vapor deposition, electrophoretic deposition and magnetron sputtering, rare earth elements such as Tb, dy and the like and compounds thereof are diffused into the magnet, and a complex multiphase structure is formed in the magnet, so that the coercive force of the magnet is improved. The grain boundary diffusion rare earth elements add extra technological processes, increase the raw material investment and manufacturing cost of the magnet, and the grain boundary diffusion cannot increase the remanence Br and magnetic energy product (BH) max of the cerium-containing magnet, even slightly reduce.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a cerium-containing rare earth permanent magnet, which is doped with high-abundance rare earth Ce in a neodymium-iron-boron magnet, compared with the existing neodymium-iron-boron magnet in the market, the cost is greatly reduced, but the magnetic property equivalent to that of the neodymium-iron-boron magnet can still be maintained.
In order to achieve the above object, the present invention provides the following technical solutions:
A cerium-containing rare earth permanent magnet has a chemical general formula of (Ce xRE1-x)30Fe69.1- yB0.9TMy) in mass percent, wherein x is more than or equal to 0.018 and less than or equal to 0.18,0.5 and less than or equal to y is more than or equal to 2.5, RE is one or more of Pr, nd, dy, tb, ho, and TM is one or more of Ga, co, al, cu, nb, zr, ti, wherein rare earth Ce element for replacing RE exists in a grain boundary in a CeFe 2 phase form in the permanent magnet, and a main phase of the permanent magnet has a RE 2Fe14 B phase structure;
The cerium-containing rare earth permanent magnet is obtained through the steps of raw material preparation, rapid hardening sheet preparation, crushing and pulverizing, magnetic field orientation molding, sintering and heat treatment, wherein:
the sintering system in the sintering step is 1030-1060 ℃, the temperature is kept for 2-5 hours, and then the temperature is controlled to be lower than 200 ℃ at a speed of 20-30 ℃ per minute.
Preferably, y is 0.5-1.8.
Further preferably, y is 0.5 to 1.2.
The permanent magnet has the following combination of magnetic properties equivalent to those of a neodymium-iron-boron permanent magnet in a use state:
The residual magnetism Br is 14.35-14.50 kGs, the coercive force H cj is 12.21-12.50 kOe, and the magnetic energy product (BH) m is 50.15-51.57 MGOe.
A process for preparing the cerium-contained sintered rare-earth permanent magnet includes such steps as preparing quick-setting sheet, breaking to obtain powder, magnetic field orientation shaping, pressing, sintering and heat treating,
In the step of preparing raw materials, the raw materials are prepared according to the following magnet components, wherein the chemical general formula of the magnet components is (Ce xRE1-x)30Fe69.1-yB0.9TMy), x is more than or equal to 0.018 and less than or equal to 0.18,0.5 and y is more than or equal to 2.5, RE is one or more of Pr, nd, dy, tb, ho, and TM is one or more of Ga, co, al, cu, nb, zr, ti;
In the sintering and heat treatment steps, placing the blank into a high-vacuum sintering furnace for sintering, wherein the sintering temperature is 1030-1060 ℃, preserving heat for 2-5 hours, then cooling to below 200 ℃ at a speed of 20-30 ℃ per minute, and then carrying out tempering heat treatment at 900-920 ℃ and 450-650 ℃ for 2 hours respectively;
In the permanent magnet obtained by the method, rare earth Ce element for replacing RE exists in a CeFe 2 phase form at a crystal boundary, and the main phase of the permanent magnet has a RE 2Fe14 B phase structure.
Compared with the prior art, the invention has the beneficial effects that:
In the prior art, the technical difficulty in preparing the high-performance low-cost cerium-containing rare earth permanent magnet is that the magnetic performance of the magnet is obviously reduced due to the addition of Ce in the neodymium-iron-boron magnet because the inner natural disposition of the Ce 2Fe14 B compound can be obviously lower than Nd 2Fe14 B (IEEE.Trans.Magn.2014, 50:2102605).
The rare earth permanent magnet has the advantages that the iron content is relatively excessive in the alloy component design of the rare earth permanent magnet, so that rare earth Ce does not enter or enters a RE 2Fe14 B magnetic main phase, but exists at a grain boundary in the form of CeFe 2 phase, neodymium in the magnet alloy is mainly remained in the RE 2Fe14 B main phase, so that the magnet has high remanence, simultaneously, a small amount of Ga, co, al, cu, nb, zr, ti and other doping elements are added, the addition amount of the doping elements is reasonably designed, the microstructure of the cerium-containing permanent magnet is improved, the grain boundary agglomeration of CeFe 2 phases is avoided (see figure 1 in the specification), and finally, when the addition amount of cerium in the magnet is in a certain component range, namely x is more than or equal to 0.018 and less than or equal to 0.18, and the magnet can still be kept to have higher magnetic performance. The invention has significant cost and price advantages.
Drawings
FIG. 1 is a schematic view of the microstructure of a cerium-containing rare earth permanent magnet of the present invention, wherein the dark gray phase is the RE 2Fe14 B main phase and the light gray phase is the CeFe 2 phase.
Detailed Description
The invention will be further described with reference to the drawings and examples.
A rare earth permanent magnet containing cerium has a chemical general formula of (Ce xRE1-x)30Fe69.1-yB0.9TMy), wherein x is more than or equal to 0.018 and less than or equal to 0.18,0.5, y is more than or equal to 2.5, RE is one or more of Pr, nd, dy, tb, ho, and TM is one or more of Ga, co, al, cu, nb, zr, ti.
Preferably, RE is one or two rare earth elements of Pr and Nd.
Preferably, the TM content is 0.5-1.8, i.e. 0.5.ltoreq.b.ltoreq.1.8.
Further preferably, the TM content is 0.5 to 1.2, i.e., 0.5.ltoreq.b.ltoreq.1.2.
The main phase of the permanent magnet with the component ratio is RE 2Fe14 B phase, and the grain boundary phase is CeFe 2 phase.
The permanent magnet is prepared through the following steps of preparing quick-setting tablets, crushing and pulverizing, magnetic field orientation forming and pressing, sintering and heat treatment.
The preparation method comprises the following steps:
s1, preparing raw materials according to design components.
S2, preparing quick-setting tablets, and smelting the prepared raw materials to prepare the quick-setting belt. Firstly, placing raw materials into a crucible of a rapid hardening furnace, carrying out vacuum induction melting under the protection of argon, keeping the temperature of 1400-1500 ℃ after the raw materials are fully melted to form alloy, and pouring the alloy liquid onto a water-cooled copper roller with the linear speed of 1.0-2.0 m/s to prepare the rapid hardening sheet with the average thickness of 0.28-0.32 mm.
S3, crushing and pulverizing, namely loading the rapid hardening tablets into a hydrogen crushing furnace, crushing hydrogen, absorbing hydrogen at the pressure of 0.1-0.2 MPa at room temperature, and then carrying out dehydrogenation treatment at the temperature of 500-600 ℃ for 2-6 hours. And adding a proper amount of antioxidant into the dehydrogenated powder, and respectively carrying out air flow grinding to obtain magnetic powder with the average granularity of 3.0-3.5 mu m.
S4, performing magnetic field orientation molding and pressing, namely performing orientation molding on magnetic powder in a 2T magnetic field press, and performing cold isostatic pressing to prepare a blank, wherein the density of the blank is 3.8-4.8 g/cm 3.
And S5, sintering and heat treatment, namely placing the blank into a high-vacuum sintering furnace for sintering, wherein the sintering temperature is 1030-1060 ℃, preserving heat for 4 hours, then cooling to below 200 ℃ at a speed of 20-30 ℃ per minute, and then respectively carrying out tempering heat treatment at 900-920 ℃ and 450-650 ℃ for 2 hours.
Example 1
A rare earth permanent magnet with a chemical formula of (Ce 0.018RE0.982)30Fe68.6B0.9TM0.5 (TM=Co, al, cu, zr; RE=Pr, nd) (wt.%) is prepared according to the above preparation method, wherein the Ce content in the rare earth permanent magnet is 1.8% of the total rare earth.
Example 2
A rare earth permanent magnet has a chemical formula (Ce0.18RE0.82)30Fe67.9B0.9TM1.2(TM＝Co,Al,Cu,Ga,Nb;RE＝Nd,Pr,Ho)(wt.％),, and the Ce content in the rare earth permanent magnet accounts for 18% of the total rare earth. The rare earth permanent magnet is prepared according to the preparation method.
Example 3
A rare earth permanent magnet has a chemical formula (Ce0.18RE0.82)30Fe67.3B0.9TM1.8(TM＝Co,Al,Cu,Ga,Ti;RE＝Nd,Pr,Dy)(wt.％),, and the Ce content in the rare earth permanent magnet accounts for 18% of the total rare earth. The rare earth permanent magnet is prepared according to the preparation method.
Comparative example 1
A rare earth permanent magnet having a chemical formula of RE 30Fe69B1.0 (re=nd, pr) (wt.%) and containing no Ce was prepared in the same manner as in examples 1 to 3.
Column samples of 10X 10mm were wire cut on the rare earth permanent magnets of comparative example 1 and examples 1-3, and the magnetic properties of the magnets were measured using a NIM-2000HF rare earth permanent magnet standard measuring device, and the magnetic properties test data are shown in Table 1.
Table 1 magnetic property test data of rare earth permanent magnets of comparative example 1 and examples 1 to 3
| Numbering device | Ce content (%) | Br/kGs | Hcj/kOe | (BH)m/MGOe |
| Comparative example 1 | 0 | 14.32 | 12.19 | 49.58 |
| Example 1 | 1.8 | 14.50 | 12.21 | 51.57 |
| Example 2 | 18 | 14.38 | 12.25 | 50.40 |
| Example 3 | 18 | 14.35 | 12.50 | 50.15 |
The cerium-containing rare earth permanent magnet provided by the invention has the advantages that rare earth Ce does not enter or enters the RE 2Fe14 B magnetic main phase less through reasonable component design, so that the magnetic performance of the magnet can be still maintained when the cerium addition amount in the magnet is within a certain component range, namely x is more than or equal to 0.018 and less than or equal to 0.18, and the residual magnetism, coercive force and magnetic energy product are not reduced. Compared with the existing neodymium-iron-boron permanent magnets in the market, the rare earth permanent magnet has the advantages of greatly reduced cost and obvious cost and price.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention.
Claims (4)
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| CN119964920B (en) * | 2025-04-08 | 2025-07-08 | 包头天石稀土新材料有限责任公司 | Neodymium-iron-boron magnet and preparation method thereof |
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| WO2018181592A1 (en) * | 2017-03-30 | 2018-10-04 | Tdk株式会社 | Permanent magnet and rotating machine |
| JP2018174323A (en) * | 2017-03-30 | 2018-11-08 | Tdk株式会社 | Permanent magnet and rotating machine |
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| CN101202143B (en) * | 2007-11-09 | 2012-01-11 | 钢铁研究总院 | Preparation method of high performance radial hot pressing magnet ring |
| CN104575920B (en) * | 2013-10-16 | 2018-01-19 | 中国科学院宁波材料技术与工程研究所 | Rare-earth permanent magnet and preparation method thereof |
| KR102156629B1 (en) * | 2017-12-28 | 2020-09-16 | 도요타지도샤가부시키가이샤 | Rare earth magnet and production method thereof |
| CN109594023B (en) * | 2018-12-18 | 2020-09-11 | 宁波铄腾新材料有限公司 | Short-process Ce-Fe-based sintered permanent magnet and preparation method thereof |
| JP7228097B2 (en) * | 2019-03-26 | 2023-02-24 | 株式会社プロテリアル | Method for producing RTB based sintered magnet |
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| WO2018181592A1 (en) * | 2017-03-30 | 2018-10-04 | Tdk株式会社 | Permanent magnet and rotating machine |
| JP2018174323A (en) * | 2017-03-30 | 2018-11-08 | Tdk株式会社 | Permanent magnet and rotating machine |
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